SSHSecure/sshkeys/ed25519.go

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2020-09-18 18:01:16 -04:00
/*
SSHSecure - a program to harden OpenSSH from defaults
Copyright (C) 2020 Brent Saner
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package sshkeys
import (
"crypto/ed25519"
)
func (k *SSHPrivKey) generateEd25519() error {
if k.Key != nil || k.PublicKey.Key != nil {
return nil // Just no-op; already generated.
}
// We cast "pk" (public key) to _ because it's an interface{} that we can't seem to
// assert to []byte. I've tried iterating, a type assertion, initializing,... nada.
// Luckily it's at a fixed half of the secret key.
if _, s, err := ed25519.GenerateKey(nil); err != nil {
return err
} else {
k.Key = s
ks := len(s) - ed25519.PublicKeySize
k.PublicKey.Key = s[ks:]
k.BitSize = ed25519Len
k.PublicKey.KeyType = KeyEd25519
}
return nil
}